diff --git a/.isort.cfg b/.isort.cfg
index cbdece3111e9f53cddffe209dd5e1ac4930ad9c5..bfe068484e9980b93f64a94cf82a9d9ce12fdcef 100644
--- a/.isort.cfg
+++ b/.isort.cfg
@@ -2,3 +2,4 @@
 line_length=100
 balanced_wrapping=True
 multi_line_output=4
+known_third_party=sympy